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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f6f2045bdba963a5404074dfc2c6fda098ec878f934029f019c12244340ab5' 
  AND token = 'Eson6Q06h4IqEXJjr8JuXgV+s3K41ZYOg1/oO4tC4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}