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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611f05f14cb94908dfc13de51c851b5874f034f84e8cabebd22206732c846c65' 
  AND token = 'JRl8K12vlAPNwIS3KljefdntTHUwp9P8P71N6cOHlr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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