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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a7289429e206384a44ff172ab0524e9748fe177ef827789af0f85d7373a0ac' 
  AND token = 'Gr2856mU9rnsBEyJjVLwAnAUYoK7cFELL2QyhixrkQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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