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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b26e093bb6b4647b0e5ad0c743e2e850d88c40c5d172ee84d1dc1e70a2adc9' 
  AND token = 'FBXb7jGtY4KwUv/Og2b6vldWWxzSLM9358yeNXmBNqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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