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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d0d54e3aacaa85e1915ce543c5de73248874ec03c5800701a736e6f0b9e337' 
  AND token = 'KpxUauJzTZ6oIkea+kUAb3i86MeahlMoAsVSIvA5aug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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