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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3d97f7dc690bfa4d550a0837f682dae3b4e8b3655da1319019f65bb1f616bf' 
  AND token = 'pjMKaUfY96DuQrD9CDQzVlXncz8kaCwY86Q3kt6r02c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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