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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38f4569c4e5e079f2a4b57000b60770bc60121abb0a97bdeadfd8a417561a0c' 
  AND token = '1tAGgRs5QGmAib7+Ei8H0zJjWWBLuGOMv7P/inAgwNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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