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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a2604792e3536abd4272b09424354e766d89f055ecda942d52f33501d53307' 
  AND token = '9d5JMHoNa08nCxNdC6xEmf8Zs6B5S5w9JeyG/7mMR9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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