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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eea8daa1b5b2f92919503ca3bde51855bdfed06653f60af61e645723fb09f40' 
  AND token = 'n0D0k32HBS7wyq8xjrD/Vc5F1pd67gxo22GnxIRpJMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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