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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0ae174829189dc922941942080e1d303f855979df9c05ce66d273f0906ed13' 
  AND token = '9v2/1Rg71YcBx68ArL0WVPpe1E2IY3Qj2SlkkHJJqz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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