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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883f3f367c2d0e48d5bc3129833c3f3e6323349163e924f2cbbecdc0d608c240' 
  AND token = 'wL+BKA5+cu3W2cpG2J5gAOJZ5tfxJf76sJCY7haPOSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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