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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0289f6488ed0b5d9a22aec4dd29b010c934723ec8830f2e6eeb6a435a489f3d6' 
  AND token = 'BVJ3d7AlPQ34H8sh63ttXyejJDJcVQVhwpn2F6QKdX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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