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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84c460f570b08fdc880d47f1816331f1509b067cc70bba3b751bf67c917addc' 
  AND token = '1RHZ2UQBCpjCLbsD3cad8PS1AlqcDkEy48hJt1NANmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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