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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa84d69377f33a0a337a23002625f2a0c2c10b280b74a1a4c4ba63ea2b2a2bd3' 
  AND token = 'lpZ3ftI6621U6JW8/OlJ+mk8QOy0oJ0kgpCROgBxnk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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