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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd194afd96e8a7185d9c929ecee06a806461a209f5ebaee7e7b58f38d0632cb49' 
  AND token = '4+TFFimdhDkJG5mSA+eUcNg6IhFhE30I/goU0wmPuVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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