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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c55c269ae0e1ff8836d751f148eaf2d4bfd748a32780c3cd9a283102ab34f7' 
  AND token = 'VJPU+/AajUpyWacgmK1dT4MJwR7wjA3NMctCRmjtYgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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