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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e248e6741d1d76a3af0bfe2ac1e0aa2a7db56784ace5f8776b61b91b4b476311' 
  AND token = 'L9EoziT2QbACdzzesK25k1VQB54pH8rkoLSzBxukCAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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