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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14295d9ae411b170726feab3c73224023ad4a72239863fc2e0f97d4eba4ec73c' 
  AND token = 'dSuXnMyHlW+CXQ/tSRLTRfYzOf9a+HCIiwgUhJepV1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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