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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fba51f1713c31fda19c73b7c7c74e032c890235a0d1ee8548c0136006cdc8f' 
  AND token = 'KAkRxTU5EI98y0zQ7VCL7F7V7EVN/LgDpEzkM9NgxUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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