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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777c4a5a7bd4f60f43ada86f4635b5a941f71ae7a8ac59eb48f7dd7cb3d28ccf' 
  AND token = '542Sppm02R9LLqgPzPjIuGpQC/LKXJm6e7q/nPdCta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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