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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45e7abf4816bedbfb2e9a1f7947aa746a8623c50e8a1c7cad7b18429f8de3f2' 
  AND token = 'KCdUGtM04SqCzDw+9PxoxVlUioKkzYBy7qfV+D39a4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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