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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fc4a95f77482978006d3ecb8d2b9aaf78f0e502f403c7ce73bbee64e50e4e5' 
  AND token = 'z4z7jNGUS5Sd0wWY+LCsUU6nH6sLUIK4p6dzmx2TuV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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