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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2ed1e00315ff2b953b65a2999a54892ab4d64fb75d0eecd8298d4b0f595c73' 
  AND token = 'YjYuSb4sW2cBo2eiP7w1ZhtK3Ubdod//9sB5ZcMqvms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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