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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7b0834bfcc37984426b3e2046365b3480ae0f20c91a6bb8934faf47f9f4a28' 
  AND token = '+deEEkPZ87YUoic/yeiIEx+j/sWtm0qdbE8LZamwjt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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