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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffcf10f252f5d1211e39fb94cc6f100c3bb4998293317eb8ae11dfe698a2312' 
  AND token = 'EGCZKjltgXnNRetpqH2UHegWtZGn/TTWI0klHNLtwz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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