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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176c1da82eec8337f2dc7b348e9ecfff39b965d3de91897e63bd363d2ceab2d7' 
  AND token = '/9D/PAtSHa7AYEvE0MIXmroqxDPM3NxFofgF+IEinSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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