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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718b00b8d7e95841b55c5c0108c8b8cac4097448c640813c7c3026129fcf1932' 
  AND token = '4Gtg3QGJ9cRXjl0av0lJOrbKVYwlxAT5uqJaLVMILMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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