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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a6ea0785261e41b37e7977b3f15d3b6e7898c9513f6e14ecc8087980ce7c73' 
  AND token = 'juca52YCUr9ozldkgcrEDfBq63G1GSJRdpCBnYq4/P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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