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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d79ed2a128f3939db0b43f968781d7c8577955660e7eb0e01f0070f3b2188ea' 
  AND token = 'B9kMIaOBNcOwNnPMlm8HbXeVp5ijaUAjd8hKKpEOqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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