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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f76a41611905f06b3de919a9c0b8213e2d48b46e1d8cac9095ed6979d674c8' 
  AND token = 'G2qbhHDEjzxOXE1j9Xq0m4DnazISYLF67y4lr8fYjnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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