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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8801d447f4ae3c8cfcec80699b2c635c75cb4a0c5062d3d3debc94f36fbbc3c' 
  AND token = 'ilyD6gQrHZHmgZLZr7Rhb/XIAdl6h2sK+EpiPEGaZ5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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