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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e80f49cdd38f6b0a188b1bccd65dd4bbc76d77aacb544ae8c6959240990cef' 
  AND token = 'QEvd0wJIPDTxpm48GPNFbs9Jxl0xMt3qw5BoBtpa6H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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