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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f7b3b28e038bfda89ebeef6158c2165d55681c9a8400c0692e0ba58b2b101c' 
  AND token = 'Ia+/otZY5LSvv+KTcCp7MQ7gs+o5LrFYt1vMCuaL5Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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