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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248e11ce5f998f154d0ed6caa2ec989e4eb59903e498ed918521fc2b3923e090' 
  AND token = '9tKcmtCMAqwxayQ95Dr2u4cyD6PFhWUjlB2ez9Xj+F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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