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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71e5b443d6ce7dcdf7e0b09478c7a25c5f8dd405ec529804fef084be8cf7508' 
  AND token = 'GpT6R9/qdGYEOPWllXaRIRI7EsgjrbizIlWWTb2GwHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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