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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b663028c45fe377ac0a1e284eb1ee7d8d3c4b62065a24dd60a48171ed8f2e2' 
  AND token = 'Fwt6LyW5CIgxlLS8qH6rCACVO3gxz1q8Dku1Fv0cg+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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