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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80977dc1fa1adcbf8429354ba738edecc15c6fe6fb61ab1ec51bb24387e68a0f' 
  AND token = 'bhaQ+2ydpWRSyGLJ7sF78Lb8CwdbWIbaaG+kAwl0p1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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