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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c8095d1492c749d5d71373072c60473ec314a5490b88fea11d579efaae3e6c' 
  AND token = 'O/ZW5/DQLGWbXtLDRfB1mX5FL+KNP9WFlA20k/x20mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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