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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a210e14c0c94454a2141d3d06ea2c91c2d69fa99a4c9727d9060797a912a0c' 
  AND token = 'oLmeOeX2AycvBhwUWowD9ddOGquq64X+fj25YPG16jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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