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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b9dc01ef50234e2026278afc8034088487bf2555d71733209a9e4c5c09c898' 
  AND token = '/C2zUn4/HFB4M76ud1poNEpKJQ7e/WRMKNP0STJvUH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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