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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0faa66d31e716a5549d1f2894f9beb8d9dba9edca54421c264d75546d7cd27a' 
  AND token = 'SwhPl3Wb1r1kRQ86QLZrl7gtYopBpq8Buw748dE59rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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