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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4ef9651b7fe941faa96cee18b01f35315ef3a3e1feaf2d4b5b6e01fce38d9e' 
  AND token = 'UAzXABOBEqoNv/j2vaYqZrhL6Lca1ciSIznMQ7vC5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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