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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e51061c015f858beb7e9ccef6ec8a3453d8d800ea7fb28cbc0c4f6eda1f9a71' 
  AND token = 'JoqVEjK9Oe8UeXEnKuwXTYNH7TdtBK+vAEpLP3m8GMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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