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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37816089bd9e710762fa34ae8bf5d281d45309059f33c71af62d6871dd6ad953' 
  AND token = '5DKQaNj0HRBwX9ezzXxYRHTBAHcRic1O5k1MsdeRP8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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