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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de1e602d8ede5fb675f0695dc286062707b68b9b03cfa8769213cffab45af4c' 
  AND token = '/oz7ieBC2Yr5TseQHfVLsmd18rHVRUU5/jZOhVZZUOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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