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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44ed611783a3594938fe3c834e95d834e3d42b55d33a3e368eaaa33ad1e614f' 
  AND token = '7RdzAks8886uOjFcs7rrJ8RwwUdPolq080g+WJQq/5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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