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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2953b4238eb6cf50af7276e3e1d269fb4c1e66c690c4b6639f2daf625b79fd76' 
  AND token = 'iS/dZ7R9T28q4yIsFcQlWDVy4uP3H8eca/prH0lv8y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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